Grinder.



GRINDER.

APPLICATION FILED APR. 11.1916- Eaten an. 12, 1918.

hurrah stares PATENT EMIL RITZ, JR., OF CHEVIOT, OHIO, ASSIG-NORTO THE HISEY-WOLF MACHINE COMPANY,

OF CINCINNATI, OHIO, A CORPORATION OF OHIO.

GRINDER.

Specification of Letters Patent.

Patented Mar. 12, 1918.

To all whom it may concern:

Be it known that I, EMIL RITZ, Jr., a citizen of the United States, and a resident of Cheviot, in the county of Hamilton and State of Ohio, have invented certain new and useful Improvements in Grinders, of which the following is a full, clear, and exact description, reference being had to the accompanying drawing, forming part of this specification.

My invention relates to electric motor grinders for external grinding, of the type generally known as parallel grinders, particularly to such grinders which are intended to be attached to lathes. It is understood that in lathes there is a cross feed which serves to bring the lathe cutting tool against the work in the lathe. On this cross feed it is the practice to mount a compound rest which has a swiveled mounting-on the cross feed.

cross feed or the rest than the usual angle.

plate bracket. The movement of the cross feed is usually limited in a lathe so that it cannot be withdrawn but a certain distance from the working center of the lathe, either because of its striking some screw handles or because the size of lathe does not justify a wide movement of the cross feed.

The angle plate bracket for motor grinders of usual type has a vertical member wh ch is dovetail d for receiving the motor and in which the motor is vertically or horizontally adjustable. Extending away from the motor side of the bracket is the angle base, which is provided with a slot or the like for mounting the same on a suitable bed plate. Thus the angle plate type of mounting projects the motor considerably away from the securing point of the bracket. The size of the motor for suitable grinding is not small and accordingly a grinder on the motor shaft will project toward the lathe center the distance of its radius plus the distance of the motor shaft from the bracket.

Thus in a small lathe the surface of the grinder will be beyond the center of the lathe on the greatest outward adjustment of the rest or cross feed, and no market can In providing a motor grinder which can be be had for motor grinders where large lathes are required.

It is therefore the object of this invention to provide a true angle plate type of mounting for a motor grinder which will enable the bracket thereof to be mounted on a cross feed or on a compound rest, without projecting the motor and the grinder on the motor shaft beyond the center of the lathe. It is also an object to provide a mounting plate for the angle plate bracket which is easily secured fast in place on either a cross feed or on a compound rest.

These objects I accomplish by that certain construction and arrangement of parts to be hereinafter more specifically pointed out and claimed.

In the drawing,

Figure l is a side elevation of the motor grinder on the bracket.

Fig. 2 is a perspective view of the bracket by itself.

Fig. 3 is a detail or plan view of the bracket.

Fig. 4 is a detail perspective of the clovetailed mounting member on the motor.

The bracket has a vertical portion 1 which is dovetailed at 2 in the usual manner for angle plate brackets. The shaft of the adjusting screw 3 passes through a boss at in the outer face of the vertical plate, and carries a screw 5 which is held in the chamber 6 in the said vertical member 1.

The motor 7 has a slidable dovetailed mounting member 8 which slides in the vertical member 1, said member 8 having a suitable segmental groove 8 provided with screwthreads to receive the screw 5 for vertical adjustment.

The parts so far described are of common use at the present time in angle plate external grinders. The motor has a shaft 9 on which is mounted a grinder shown diagrammatically at 10, which for effective work should be of a large diameter, since the speed of the motor is usually not sufficient for a small grinder wheel, on direct drive.

Instead of extending away from the base of the vertical member of the bracket as is usually the case, the base plate 11 of said bracket extends from the lower end of the cutaway portions 12, and within these cutaway portions are the holes 13 for the securing screws or bolts 14. At the under side of the base plate 11 is formed a circular disk 15, which 1s of a size to fit on the revolving table in a cross feed. The table, not shown, should be bored with holes to receive the screws 14, and the bracket can. therefore be mounted direct on a cross feed of'the usual type.

The purpose of the cutaway portions in the base plate is to allow the screw or bolt heads to be available'when the motor is .at

a low point in the bracket. The cutaway portions are deep enough to permit the insertion of a fiat wrench without any more space to work in than the said portions. It can be seen that the motor center is forwardly from the inner end of the bracket base, and thus the grinder is brought to a position without extra adjustment so that it can be used to grind a piece of work such as at 16 (Fig. 1) when said piece is supported at the lathe center 17.

Many eli orts have been made to provide a mounting means for a motor on a lathe which does not call upon the cross feed for too much of an adjustment in order to bring the grinder on the motor shaft to an operative position. But so far as is known to me, it has not been thought possible to employ the well known angle plate bracket for this work and hence the simple method of vertical adjustment as in the angle plate bracket has not been possible in such de- I vices.

I do not wish to be limitedin the claims that follow to the eXact structure described 7 in the foregoing specificatiomas the descripclaims because of my failure at this time to appreciate the full usefulness of my invention, as I intend it to be used in the future in any manner that may turn out tobe economical and convenient, and that mere mechanical changes necessary to adapt it to future uses be fully included in the scope of my invention.

Having thus described my invention, what I claim a new and desire to secure by Letters Patent, is:-'-' r 1. In a motor grinder for mounting on a lathe, .a motor, "'a grinder on saidmotor, and an angle plate bracket for adjustably mounting said motor, said bracket-having vertical member upon which the motor is adjusted, and a horizontal member extend 'ing beneath the motor with said horizontal member provided with the mounting means for the entire bracket. 7

2. In a motor grinder for mounting on a lathe, a motor, a grinder on said motor, and an angle platejbracket'for adjustably mounting said motor, said bracket having a Verticalmemhe-r upon which the motor is adjusted, and a horizontal member extending beneath the motor, and means for mounting said horizontal member on a lathe,

said means constituting the only support for cutaway portions in the said horizontal' member, and holes therein located within the cutaway portions, said cutaway portions and holes constituting the solesupport of the bracket. Y Y

4. In a motor grinder for mounting on a lathe, a motor, a grinder on said motor, and an angle plate bracket for adjustably mounting said motor, said bracket having a vertical member upon which the motor is adjusted, a horizontal member extending beneath the motor, and means for mounting said horizontal member on a lathe located beneath the motor, said means comprising screw members in the horizontal member, and a disk portion depending from the base of said member, whereby said bracket can be mounted on a cross feed member of such lathe.

'EMIL RITZ, JR.

Copies of this patent may be obtained for five cents each. by addressing the Commissioner of Patents,

Washington, D. C. 

